Rence



(NoModel'J W. 'S. LAWRENCE 8: L0. GHAPIN.

HARROW.

No. 301,375. Patented July 1, 1884.

UNITED Starts PATENT @rricn.

\VILLIAM S. LAW'BENOE AND LEBEUS O. CI-IAPIN, OF KALAMAZOO, MIG-H.

HARROW.

SPECIFICATION forming part of Letters Patent No. 301,375, dated July 1,1884.

(No model.)

To aZZ whom it Tl'bfiiy concern:

Be it known that we, W'iLLLiM S. LAW- nnncn and Lnnnns G. GHAPIN,citizens of the United States, residing at Kalamazoo, county ofKalamazoo, State of Michigan, have 3' ointly' invented a new and usefulImprovement in Harrows, of which the following is a specification.

Our invention has for its object certain improvemeuts hereinafterdescribed and claimed to facilitate the construction and increase theutility of such devices.

In the drawings forming a. part of this specification, Figure 1 is aside elevation of the tooth and a section of the tOO't-llfl%tlll8,partly in perspective. Fig. 2 is a detached part of Fig. 1 in enlargedperspective. Fig. 3 is a longitudinal section of 6; at, detached partsof Fig. 1 in vertical projection,

showing the construction of the tooth-frame.

Fig. 5 is a horizontal projection of the same, and Fig. 6 is thebarrow-tooth in enlarged perspective.

The harrow-franie consists of the metal tootltbars c a, crossing eachother at the desired location. These tootlrba-rs are secured togetherwhere they cross by means of the clamps c c and bolts 27, Fig. 1. Weprefer to make the tooth-bars a a square and cross them with their edgesengaging each other, in which case, when the clamps c c are firmlybound, said edges are embedded in each other, as shown at e in Fig. 4.In this figure the bars ct a are separated a little, to illustrate theeffect which clamping the bars tightly together by means of the clamp cc" and bolts i has upon the engaging edgesat e, as before stated. Thebars thus embedded and secured together cannot become misplaced by thestrain upon them when in use. Such a construction and mode of useobviates any necessity of inortising the bars or of forming the-notchesin theinwhcn constructing them. If preferred, the tooth-bars may be ofany other form, and

may have notches formed in each where they cross, thus adapting each tofit the other.

. The clamp is composed of the upper andlower castings, c and c, andbolts t. These castings are provided with channels i, conforming to theform of the tooth-bars a a, and with lugs 22 of a proper length toextend by one bar on each side thereof and rest against the other bar,Fig. 1. The lugs n c are also provided with like channels or notches 0,which receive he bar a. Two bolts, 11, are used, as indicated by thebolt-holes 22.1) in Fig. 2.

1) shows a tooth which we design using. It has an upright or straightportion, A, for con meeting with a tooth-holder, B, and a lower curvedportion terminating in aworking end, Fig. 6. The tooth D is made fromlightweight metal, and is made non-elastic by forming a central integralrib on the back side thereof. Thus the tooth is made light and rigid anda saving of steel eifected.

In Fig. 1 a spring, a, is shown connected with the clamp c c by means ofa bindingplate and the bolts This spring a and toothholdcr B areconnected together. As these parts form the subject of a priorapplication filed by Ohapin and Rix, January 11, 1884:, Serial No.117,138, no further description of them is needed herein.

Having thusdescribed our invention, what we claim as new, and desire tosecure by Letters Patent, is

1. The combination, with tooth -bars provided with en gaging-surfaceswhere they cross, which are adapted to be embedded each in the otherwhen under pressure, of a clamp device adapted to press, embed, andsecure said bars, substantially as set forth.

The combination, with the embedded tooth-bars, the clamp having thechannels and notched lugs, and the bolts and bindingplate, of thebarrow-tooth and the spring connecting the tooth with the clamp,substantially as specified and shown.

3. The combination, with the square toothbea-ms having the engagingedges adapted for embedding in each other. of the clamp adapted forsecuring and embedding said bars, substantially as set forth.

In testimony of the foregoing we have here unto subscribed our names inthe presence of two witnesses.

WILLIAM S. LAWRENCE. LEBEUS G. CHAPIN. W'itnesses:

JOHN G. PERKINS, A. Z. Chess.

